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King County returns for phase two of Dockton seawall repairs on Vashon Island Aug. 31-Sept. 17

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King County Local Services

King County returns for phase two of Dockton seawall repairs on Vashon Island Aug. 31-Sept. 17


King County Road Services will complete the second of two phases of work to fill sinkholes and repair damaged areas of the 103-year-old seawall located along Dockton Road SW. The first phase of repairs, completed in late 2019, addressed similar work. Phase two begins Monday, August 31 and lasts through September 17. A signed detour will be provided, local access will be maintained.


The work requires a full closure of Dockton Road SW at Tramp Harbor Road SW and extending southward for about 1,000 feet. A posted detour will direct drivers coming from either direction to Monument Road SW. Work is expected to begin at 7 a.m. Monday, Aug. 31 and continue through 4 p.m. Thursday, Sept. 17.


Crews will work from the early morning until the evening Monday through Friday, although tides will affect specific start and stop times.


During phase one, King County repaired 90 feet of failed timber wall and backfilled 23 small sinkholes adjacent to the seawall and two 13-foot-diameter sinkholes near the parking lot. Phase two will repair an additional 100 feet of seawall and another nine sinkholes that were found during a recent annual seawall inspection at the beginning of August. The County split the repairs into two phases to address the most urgent repairs as soon as possible. 


As a reminder to residents, the pier owned by the Vashon Park District located near the work area is closed.


Additional work coming to Vashon Island

Later this fall, Road Services will return to another location on Vashon Island to repair the north expansion joint on the Judd Creek Bridge , which is located on Vashon Highway, south of SW Quartermaster Drive. The bridge will be closed to all traffic for three weeks during construction and a signed detour will be provided.